Diodes Incorporated MMBZ5252BS-7

Overview

MMBZ5252BS-7 from Diodes Incorporated is a dual isolated 24 V ±5% surface-mount Zener diode in SOT-363 package, rated for 200 mW power dissipation, 33 Ω zener impedance at 5.2 mA test current, and reverse leakage ≤0.1 μA at 18 V, used for precision voltage regulation and overvoltage protection in space-constrained DC bias networks.

For engineers reviewing the MMBZ5252BS-7 datasheet, MMBZ5252BS-7 pinout, MMBZ5252BS-7 application, or MMBZ5252BS-7 equivalent, key selection criteria include nominal zener voltage tolerance (±5%), low leakage at VR = 18 V, thermal resistance (625 °C/W), dual-diode isolation, and RoHS-compliant matte tin plating on Alloy 42 leadframe.

Technical Context

This dual-Zener device integrates two electrically isolated 24 V zener junctions in a single SOT-363 package, enabling independent voltage reference or clamping paths without cross-coupling. Each diode operates with a specified test current of 5.2 mA and exhibits tight 22.8–25.2 V breakdown range under standard conditions.

It delivers stable regulation across –65 °C to +150 °C ambient, with thermal derating beginning at 25 °C per the 625 °C/W RθJA rating. The planar die construction ensures repeatable breakdown characteristics and compatibility with automated reflow soldering per J-STD-020D Level 1 moisture sensitivity.

Key Specifications

Pinout & Package

SOT-363 package features six terminals in a 2.2 × 1.35 mm body with 0.65 mm pitch; molded plastic case rated UL 94V-0, lead-free matte tin plating, and polarity indicated by top-view marking diagram.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-Zener voltage regulation applications.

Compared with BZX84-C24LT1G and MMBZ5252B-7-F, MMBZ5252BS-7 uniquely delivers two fully isolated 24 V Zeners in one SOT-363 footprint-enabling compact dual-supply monitoring, differential reference generation, or fault-tolerant clamping where shared failure modes must be avoided.

Availability

MMBZ5252BS-7 is available at Aetrix Electronics and suitable for industrial sensor conditioning, automotive BCM power monitoring, medical portable diagnostics, and telecom line card supervision requiring stable component supply and long-term lifecycle continuity.

Supply support for MMBZ5252BS-7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.

The MMBZ52xxBS series belongs to Diodes' precision Zener portfolio, engineered specifically for high-density, low-power voltage regulation and transient suppression in automotive, industrial, and medical applications where dual-element isolation and strict RoHS compliance are mandatory.

FAQ

What is the maximum reverse leakage current for MMBZ5252BS-7 at 18 V?

The maximum reverse leakage current is 0.1 μA at VR = 18 V and TA = 25 °C, as specified in the Electrical Characteristics table. This value remains valid across the full operating temperature range (–65 °C to +150 °C), with typical leakage increasing to ≤1.0 μA at +150 °C per characterization curves in DS31039 Rev. 15–2.

Can MMBZ5252BS-7 be used in place of a single 24 V Zener diode?

Yes, either Zener element (C1/A1 or C2/A2) can be used independently as a 24 V regulator or clamp. However, the unused NC pins must remain unconnected, and the second Zener must not be shorted or loaded, as it shares thermal mass and affects overall power derating behavior per the 200 mW total rating.

Is the SOT-363 package compatible with standard reflow profiles?

Yes, the SOT-363 package meets J-STD-020D Level 1 moisture sensitivity and is qualified for lead-free reflow up to 260 °C peak temperature. Recommended pad layout and thermal relief patterns are published in Diodes' AP02001 application note to ensure void-free solder joints and mechanical reliability.

How does the dual-isolation benefit circuit reliability?

Dual isolation prevents fault propagation between channels: if one Zener fails short, the second remains functional for backup monitoring or redundancy. This is critical in safety-aware systems like automotive BCMs or medical diagnostics, where single-point failures must not compromise both reference and protection paths.